Grinding machine



July 17, 1923.

E. W. MIKAELSON ET AL GRINDING MACHINE Filed June 27 1919 2 Sheets-Sheet1 July 17, 1923.

E. w.' MIKAEILSON ET AL.

GRINDING MACHINE Filed June 27.

1919 2 Sheets-Sheet 2 Patented July 17, 1923.

it hit .3 T LATE 3 v meant QFFHQEP ERIK *w-MI AELson AND ANDREW A.itnAvE, or EASTON. r'nNitsYnvAmn, As- "sxenons T "rnnnnwnnn "ENGINEERINGCOMPANY, A coRroRAnon -or PENN- SYL'VANIA.

GRINDING MACHINE.

Application filed June 27, 1919. Serial No. 307,083. 7

and a grinding wheel and suction housing at the other end, together withan intermediate support at or about the center of gravity of the entiresystem, the grinder being controlled by the operator in a wellunderstood manner.

An object of this invention is to provide trunnion supporting means forthe machine. capable of permitting universal movement of the wheehaswell as swinging movements in various planes, one particularlyadvantageous result of this invention being that a very long straightsurface can be ground, whereas previously proposed suspended types ofgrinders have been limited as to the extent of surface which could beground without resetting the work.

A further object ofthe invention is to provide an improved mounting andarrangement'of theexhaust blower whereby it is kept out of the way adjacent'the motor end, and a still further object of the invention is toprovide a strong and yet simple construction which will withstand hardusage.

Figure 1 is an elevation of a machine embodyingthe invention,

Figure 2-is a plan View, a

Figure 3 is a cross section on the lin 3, 30f Figure l,

Figure 4 is a sectionon the line 4, 4 of Figure 2, 1

Figure 5 is a front elevation,

Figure 6 is a section on an enlarged-scale showing the driving mechanismfor the wheel, and

. Figures 7 and 8 show a modification.

1 represents a foundation carrying a 'socketed pedestal 2 receiving avertically disposed stub shaft-"3 supported on a bottom stop bearing '4and held in engagement with the'fiange- 5. Stub-shaft 3 carries a frame-c0n-s-istingof angle iron tracks 8 connected at their ends by uprights9, 9i acting as stops and the uprights bein'gconnected by lower crosspieces 10, 11 being bracing angle plates at each end. This entirestructure from the stub shaft 3 is rotatable in, the

pedestal 2,. and is removable by' lifting when ridge on the tracks 8 sothat the dirt will not interfere with rolling. The trunnion ring 13 isclamped to the tube 12 by setscrew 15, so that the tube can belongitudinally adjusted the ring, but. also could be an-gularly adjustedif desired. By using larger wheels 48 to roll on the floor or ground andhold the motor and wheel elevated, as in Figures 7 and 8, thepedestaland tracks can be dispensed with, and a machine provided whichcan beused anywhere in the shop or yard where thepower can be supplied to the,motor by cable. By suitable proportioning and design of the wheels,pedestal and tracks, the :machine can'be used either on the ground orontracks as desired, i

At one endof the tube 12 is a mQtor 16, centrifugal exhauster 17connected to settling chamber 18 and supported by a pipe 19 connected tothe hood 20 over the wheel 21 through flexible tube 22, the motor andexhauster being preferably mounted on the same support 23 as shown,thissupport being clamped to the rear end of the tube 12 as at 24.

At the front end of the tube 12, the grinder carrying frame and housing25 is rotatably mounted thereon by 'a joint 26, shown in detailin Figure6, so as tov permit the grinder and its driving connections to berotatable on the tube. As seen in Figure 6, the tube 12 carries rollers27 on which the grinder carrying frame, 25 bears. 28 is the 'motor shaftprovided at the front end with a separable coupling 29 which receivesthe front shaft 30, the latter being supported in rear bearing 31 and afront bearing 32and having a thrust bearing 33. At the 7, front end ofshaft .30. is a bevel pinion 34 meshing with a similar gear .35 ongrinder shaft 36,,the wheel 21 being fastened thereonin the usual mannerbetween collars 37. Thegrinder shaft' 36 is supported. in bearings 38and a thrustbean,

vi-ng 39, carried by the "housing 25. The housing is horizontallydivided similarly to automobile gearing, and the upper half 40 carriestaframe 41 having the controlling handles lfz, for the operator to grasp.The frame 41 also supports the hood 20. The hood 20 may be of anydesired design, and is preferably provided with a settling chamber 4:3as shown, this settling chamber being connected to the flexible tube 22and being itselfrarried by a frame 14 extending laterally from the jointmember 26. The function of the flexible tubing is to maintain thesuction connection while the operator 15 tilts the wheel out of itsnormal vertical plane. The parts are so mounted and disposed that thegrinder head is practiany balanced to remain in this vertical plane,weights being used if necessary for 'z this purpose, 4E5, 46 aredeflectors placed in the settling chambers 18,, 43 respectively,the'purpose of whichis to trap as much of the heavy material as possiblebefore it reaches theexhauster 17 it having been found in practice thatthe exhauster has very little to do but to move air, and hence itsbearings do notbecomeworn out "by the grit which would otherwisebepresent. The puttingof the blower at the front end near the wheel hasbeen found objectionable for this reason in other types of grinders, itbeing diflicult to keep the bearings in good condition. Similardifiiculty has arisen where it ,was sought to carry off the dust th ghthe tube, as the dust tends to settle 'in the shaft bearings andsometimes in the gears and has given considerable trouble.

The operation I of this machine will be understood from the foregoingdescription, 40 but it is pointed out that by reason of the travelpermitted by thewheels, this machine can cover unlimited territory in ashop er yard and can also work on much i, larger surfaces, withoutmoving the work,

than has been permitted by other machines. Inasmuch as the machine isself-contained "and "with no auxiliary appendages, same can bepractically balanced, and the weight is always supported on the floor oron a solid foundation,.it is found to be less tiring to the operatorthan where he has to man- ,"ge a heavy mass suspended from the ceilng. pVarious modifications and changes may b e1 ma de 'in the details "hereindescribed- ,without departing from the scope of the appended claims.What is claimed, isi.

' 1'. Inagrinder, a motor, a grinding wheel driven thereby, a main bodycarrying, said inotorf at lone end and said grinding wheel attheopposite end, andv wheeled supporting me n directly carried by saidmain body intermediate; the grinding wheel and the motor,"said motor andgrinding wheel being substantially in. balance jrelatively to saidsupportingmeans whereby the operator adjacent the grinding wheel end canreadily manipulate the grinder over thework. f

2. In a grinder, amotor, a grinding wheel driven thereby, a main bodycarrying said motor at one endland saidgrinding wheel at the oppositeend, a swivel connection betweensaid body and said grinding wheel forpermitting variation of the plane of rotation ofthe latter,andasupporting axle and wheels directly carried by said main bodyintermediate the grinding wheel and the motor. i}

3. In a grinder,fla pedestal, arotatable frame carried thereby, atr-ackway secured to said frame, a grinding'machine comprising agrinding wheel and a driving motor, and means for mounting said machineso as to be movable on said trackway.

4. In a grinder, in combination: a pedestal; a vertical shaft;journalled in said pedestal whereby the shaft may rotate on its'verticalaxis; a horizontal trackway supported by the shaft; wheels supportedfbyand rollable on said trackway a trunnion having a horizontal axissupported by said wheels; a somewhat elongated frame supported by saidtrunnion; means for 'grinding supported by said frame, the center ofgravity of the frame and grinding means lying in the line of action ofthe trunnion wherebythe grindingmeans may be given a motion oftranslation, rotation in a horizontal plane or oscillation in a verticalplane and the said center of gravity may be maintainedat a constantelevation.

5. In a grinder, in'combination: an elongated frame: a. grinding wheel;means" for supporting the grinding wheel at one end of the frame wherebyit may be oscillated about the longitudinal axis of theframe; a'motorsupported at the otherend of'the frame; means for supporting the framewhereby it is movable in both a horizontal plane in motion oftranslation or rotation and in-a vertical plane and thecenter of gravityis always maintained at a constant elevation.

6. In a grinder, in combination: a frame;

a motor supported at one point by said frame; a grinding wheel supportedat another point by said frame; 'a pedestal revolvable upona verticalaxis; a horizontal trackwa-y supported by the pedestal supporting meansmovable upon the trackwayy means for attaching said supporting means tosaid frame whereby the frame is movable thereon and theline of action ofsaid supporting means passes through substantially the center of gravityof the system com-- prising the frame and the wheel'and'the motor,whereby no movement of the wheel in' either a horizontal or verticalplane alters the eleyation of the 'center of gravity of said system. I

7. In a grinder, in combination: an elongated frame; a grinding wheelsupported by one end of the'frame; a motor supported at the other end ofthe frame; means for driving the wheel by the motor; means forsupporting the frame whereby it is movable in both a horizontal plane inmotion of translation or rotation. and in a vertical plane and thecenter of gravity is always maintained at a constant elevation.

57 wheels whereby they may revolve and the axis of the trunnion mayrevolve in a horizontal plane whereby the frame may have a motion oftranslation, rotation in a horizontal plane and oscillation in avertical plane.

9. In a grinder, a pedestal, a rotatable frame carried thereby, atrackway secured to said frame. a grinding machine comprising a grindingwheel, a driving motor, and a swivel connection interposed between saidwheel and said motor to permit variation of the plane of rotation of theformer, and means for mounting said machine so as to be movable on saidtrackway.

10. A grinding machine comprising a supporting structure, an elongatedarm, power means at one end of and carried by the arm, a grinding toolat the other end of the arm, driving connections between the power meansand grinding tool, a pivotal support for the arm. and means whereby thearm may be adjusted in the direction of its length with respect to thepivotal supporting means to balance the arm and parts carried thereby.

11. A -grinding machine comprising an elongated rock arm with a powerunit at one end, a grinding tool at the other end, driving connectionsbetween the power unit and grinding tool, and means associated with theaxis of rocking of the arm for permitting lengthwise movements of thearm and to balance the arm and permit rocking movements thereof.

12. A grinding machine comprising a supporting structure, an elongatedarm pivotally mounted on said structure, a power member on one end ofthe arm, a grinding tool at the'other end of the arm, drivingconnections between the power member and the tool, and means whereby thearm may be adjusted lengthwise of the supporting structure withoutdisturbing the pivotal connection. i

13. In a grinder a turn-table having a trackway positioned thereon, anelongated body portion, a sleeve for encircling said body portion andadjustably connected therewith, trunnions projecting from opposite sidesof said sleeve, a wheel on each trunnion adapted to roll on saidtrackway and upstanding arms carried by said trackway, said arms servingas stops for the wheels and as a means whereby said turntable may berotated.

14. Ina grinder an elongated body portion, a sleeve encircling said bodyportion near its mid length and adjustably connected therewith,trunnions radially extended from opposite sides of said sleeve, wheelsmounted on said trunnions, a motor carried at one end of said. bodyportion, a grinding wheel carried at the other end thereof, and meansoperatively connecting said motor and grinding wheel.

15. In a portable grinder, a motor, a grinding wheel driven thereby, anelongated main body carrying said motor at one end and said grindingwheel at the other end,

and a supporting wheel attached on each side of the intermediate portionof the main body, and adapted to run with longitudinal movement of thebody on a low supporting surface, said wheels being so positioned thatthe motor at one end substantially balances the grinding wheel at theother end and permitting the operator at will to traverse the grindingwheel in any direction longitudinally of the body by rolling saidsupporting wheels on a horizontal surface without vertically shiftingthe center of gravity of the entire machine.

ERIK W. MIKAELSON.

ANDREW A. NEAVE.

